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This is my system. The stop is at the surface right before the last lens. The apeture type is float by stop size. Clealy, some rays of the blue field are blocked by the stop, so I set vignetting for the field. However, all of the vignetting parameters are still zero. What should I do?



Is ray Ray Aiming On in this case? 


Thank you Andrey. Have a look at this article if you want more information on Ray Aiming: How to use Ray Aiming


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